a=("1"
   "2"
   "3")

for item in ${a[*]}
do
    echo $item $0
done

echo $[100 / 2]
name=`date -d "today" +"%Y%m%d:%H%M%S"`
echo $(date -d "today" +"%Y%m%d:%H%M%S")
[ -s tests.sh ] && echo "hello"

if [ "a" in "a b c" ]; then
    echo "xxxxxxx";
fi
